Bacteria sampled from human skin are plated on TSA and EMB agar. The bacteria grow on the TSA plate but do not grow on the EMB plate. The bacteria are _____.

What are the steps of simple staining in the correct order?

The Escherichia coli strain 0157:H7 is normal flora found in the GI tract of many different animals. Therefore, if this strain of E.coli were transferred to the human GI tract it would not cause any adverse effects.

You preform the Methyl Red and Voges-Proskauer Tests on both S. epidermidis and E. coli.  S. epidermidis was positive for both the Methyl Red and Voges-Proskauer tests.  E.coli was positive for Methyl Red and negative for Voges-Proskauer.  What do these tests results tell you about S. epidermidis and E.coli’s metabolic pathways?

A student performed a gram stain on a gram positive bacillus and obtained the stain shown below:     What is the explanation of these results?

What indicates a positive Voges-Proskauer test?

The biochemical test, Methyl Red, was preformed on an unknown microbe.  The result was a color change from pale yellow to pink.  What conclusion can you make about this microbe?

Which of the following are permissible in an actual microbiology lab?

A microbe that only produces turbid broths in pH tests at pH 4 is considered a(n) _____.

What is the difference between halophiles and halotolerant microbes?